Transition coupling



FIG. 1 is an exploded perspective view of a transition coupling showing my new design;

FIG. 2 is a side elevational view thereof, the other sides being the same as the side shown;

FIG. 3 is an end elevational view taken from the right of FIG. 1; and

FIG. 4 is an end elevational view taken from the left of FIG. 1.

The fragmentary broken lines representation of pipes in FIGS. 1 and 2 are for purposes of illustration only and form no part of the claimed design. 

The ornamental design for a transistion coupling, as shown and described. 